Abstract
The aeronautics industry’s competitiveness has led to the need to increase productivity with one shot drilling (OSD) systems capable of drilling stacks of dissimilar materials (fibre/metal laminates, FML) in order to reduce riveting times. Among the materials that constitute the current aeronautical models, composite materials and aluminium (Al) and titanium (Ti) alloys stand out. These one-pass machining techniques produce high-quality holes, especially when all the elements that have to be joined are made of the same material. This work has followed a conventional OSD strategy and the same cutting conditions applied to CFRP (carbo-fibre-reinforced polymer), Al and CFRP/Al stacked sheets to know the wear mechanisms produced. With this purpose, results were obtained by using current specific techniques, such as microstructural analysis, monitoring of the shear forces and analysis of macrogeometric deviations. It has been determined that when these drilling techniques are applied under the same cutting conditions to stacks of materials of a different nature, the results of the wear mechanisms acting on the tool differ from those obtained when machining each material separately. This article presents a comparison between the effects of tool wear during dry drilling of CFRP and UNS A97075 plates separately and when machined as stacks.
Highlights
The aeronautical sector has always been a benchmark in research, development and innovation.This has been motivated by the intense competitiveness that exists within the sector, generating a continuous need to improve functional, environmental and energetic efficiency in the processes, guaranteeing quality and seeking a direct impact on economic performance [1].The first challenge the aerospace industry faces in its fourth revolution is to automate processes that nowadays include the extensive use of manual labour, especially in relevant operations such as assembly operations [2].Among the different joining methods available in the industry, riveting is still most often used, regardless of the materials involved in the assembly
The present study focuses on comparisons when facing drilling stacks of diverse types of material, resulting in a very different situation from machining them separately [7]
Materials 2018, 11, x FOR PEER REVIEW. This case requires us to study the wear mechanisms that affect the tool during the drilling process. This case requires us with to study the wear relating mechanisms affect tool of during the in drilling of composite material stacks metal alloys, them that to the finalthe quality the drill order to process of composite material stacks with metal alloys, relating them to the final quality of the drill improve the performance of the process
Summary
The aeronautical sector has always been a benchmark in research, development and innovation. The present study focuses on comparisons when facing drilling stacks of diverse types of material, resulting in a very different situation from machining them separately [7] This case requires us with to study the wear relating mechanisms affect tool of during the in drilling of composite material stacks metal alloys, them that to the finalthe quality the drill order to process of composite material stacks with metal alloys, relating them to the final quality of the drill improve the performance of the process. This will favour the virtual variables directly related to tool wear during drilling, such as axial force [7] This will favour the integration of the company, being one of the main paradigms pursued in industry 4.0.
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